These are invertebrates, beautiful and gripping animals which have no eyes, brain and heart. Jellyfish come in completely different sizes. Some are like a finger, and some are bigger than human. There are very dangerous jellyfish, but there are completely harmless. Jellyfish swim badly, so their life is controlled by water. The life cycle of each one is different. Most jellyfish live less than a year, some live even about a week.
An interesting fact about jellyfish: only among them there is one species of animals that lives forever.
Would you like to live forever?
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